* {
  padding: 0;
  margin: 0;
}

em,
i {
  font-style: normal;
}

ul,
ol,
dl {
  list-style: none;
  margin-top: 0;
  margin-bottom: 0 !important;
}
li{
  list-style: none;
}

input,textarea {
  border: 0;
  outline: 0;
}

p {
  margin-bottom: 0 !important;
}

dd,
dl {
  margin-bottom: 0 !important;
}

/*统一的宽度*/
.w {
  width: 1200px;
  margin: 0 auto;
}

button {
  border: 0;
}

.hiddenBox {
  display: none;
}

.showBox {
  display: block;
}

/*隐藏多余的文字*/
.hiddenText {
  overflow: hidden;
  text-overflow: ellipsis;
}

img {
  vertical-align: top !important;
}

/*flex布局的垂直和水平居中*/
.centerLocation {
  display: flex;
  justify-content: center;
  align-items: center;
}

/*首页每个模块的位置*/
.video-item,
.teacher-item {
  margin-top: 5px;
  padding: 10px 3px;
}

.first {
  margin-left: 0 !important;
}

/*取消router-link的样式*/
a {
  text-decoration:none !important; 
  color: #4f555d !important;
}
/*每个页面的盒子*/
.MainPageHeader{
  margin-top: 70px;
}

